XML 35 R43.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Pre-Production Costs Related to Long-Term Supply Agreements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 27, 2014 | Sep. 28, 2013
Preproduction Costs Related to Long-term Supply Arrangements [Abstract] |  |
Capitalized pre-production E&D costs | $ 143.0 | $ 139.8
Capitalized pre-production tooling costs related to customer-owned tools | 118.2 | 164.3
Cash collected related to E&D and tooling costs | $ 247.2 | $ 296.5

X
- Definition Amount of recoverable preproduction engineering and design costs related to long term supply agreements capitalized during the reporting period. + References No definition available. + Details
Name: | lea_PreproductionEngineeringAndDevelopmentCostsRelatedToLongTermSupplyArrangementsCostsCapitalized
Namespace Prefix: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of recoverable preproduction tooling costs related to long term supply agreements capitalized during the reporting period. + References No definition available. + Details
Name: | lea_PreproductionToolingCostsRelatedToLongTermSupplyArrangementsCostsCapitalized
Namespace Prefix: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cash recoveries of preproduction engineering, design and tooling costs incurred on behalf of a customer. + References No definition available. + Details
Name: | lea_RecoveriesOfPreproductionCostsRelatedToLongTermSupplyAgreements
Namespace Prefix: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration